To convert cubic feet per hour to barrels per day, multiply by 4.27458256. That factor is the whole relationship: both units measure volumetric flow, so the conversion is a proportion with no offset and no substance-specific constant.
Gas appliance and small-flow rating in the US. The unit oil production is reported in worldwide.
Standard versus actual volume. Gas flow in CFM depends on pressure and temperature, which is why compressor ratings say SCFM and specify the reference conditions. Converting the number is exact; comparing two ratings measured at different conditions is not. Below the calculator there is a step table for the values people look up most, and a second table putting real volumetric flow figures into barrels per day so the number you get has something to be compared against.
The formula
cubic feet per hour- The amount you are converting, in cubic feet per hour
4.2745825603- The exact number of barrels per day in one cubic foot per hour
barrels per day- The converted result
How it works, step by step
- Enter the value in cubic feet per hour.
- It is multiplied by 4.2745825603, the exact factor between the two units.
- The answer is shown in barrels per day, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
A shower head: 20.3 CFH in barrels per day
A shower head comes to about 20.3 CFH. Multiplying by the factor: 20.3 × 4.27458 = 86.774 bbl/d. Dividing the answer back by 4.27458 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
A garden hose: 38.1 CFH in barrels per day
At 38.1 CFH (a garden hose), the same quantity in barrels per day is 38.1 × 4.27458 = 162.862 bbl/d. One cubic foot per hour is 4.27458 barrels per day, so the numbers grow as expected.
How to read your score
Frequently asked questions
How many barrels per day are in one cubic foot per hour?
Exactly 4.2745825603. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert cubic feet per hour to barrels per day?
barrels per day = cubic feet per hour × 4.2745825603. Reversed, cubic feet per hour = barrels per day ÷ 4.2745825603, which is the same as multiplying by 0.233940972222.
Which is the bigger unit, the cubic foot per hour or the barrel per day?
The cubic foot per hour. One cubic foot per hour equals 4.27458 barrels per day.
What does this quantity actually measure?
Both units measure volumetric flow. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a cubic foot per hour?
Gas appliance and small-flow rating in the US.
What is a barrel per day?
The unit oil production is reported in worldwide.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do CFH to bbl/d in my head?
Plenty of people do this in their head: multiply by 4.3 instead of using the exact factor 4.27458256. At 100 that shortcut gives 430 barrels per day, off by 2.542 barrels per day or about 0.59%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Cubic Feet Per Hour to barrels per day reference tables
| Cubic Feet Per Hour | Barrels Per Day |
|---|---|
| 0.5 CFH | 2.13729 bbl/d |
| 1 CFH | 4.27458 bbl/d |
| 2 CFH | 8.54917 bbl/d |
| 3 CFH | 12.8237 bbl/d |
| 5 CFH | 21.3729 bbl/d |
| 10 CFH | 42.7458 bbl/d |
| 20 CFH | 85.4917 bbl/d |
| 25 CFH | 106.865 bbl/d |
| 50 CFH | 213.729 bbl/d |
| 75 CFH | 320.594 bbl/d |
| 100 CFH | 427.458 bbl/d |
| 250 CFH | 1068.65 bbl/d |
| 500 CFH | 2137.29 bbl/d |
| 1000 CFH | 4274.58 bbl/d |
| 5000 CFH | 21,372.9 bbl/d |
Exact factor: 1 cubic foot per hour = 4.2745825603 barrels per day.
| Quantity | CFH | bbl/d |
|---|---|---|
| A dripping tap | 0.01271 CFH | 0.05434 bbl/d |
| A bathroom tap | 12.71 CFH | 54.34 bbl/d |
| A shower head | 20.34 CFH | 86.95 bbl/d |
| A garden hose | 38.14 CFH | 163 bbl/d |
| A fire hydrant | 7628 CFH | 3.261e+04 bbl/d |
| The Thames at London | 8.264e+06 CFH | 3.532e+07 bbl/d |
Published reference values, converted with the same factor this page uses.